Device for turning piston rings



Patented Mar. 21, 1933 I UNITED STATES FFI'CE" ALEXASDEB ABRAMSON, FPRAGUE, CZECHOSLOVAKIA DEVICE FOR TURNING ZEISTON RINGS Applicationfiled July 8, 1931, Serial No. 549,430, and in Germany July 1'7, 1930.

This invention relates to a process and corticeable when a number ofpiston rings are responding apparatus for turning piston being turned inthe same operation. More rings of the type in which a piston ring isheld over, the use of this arrangement is undesirduring operationbetween the surface plate of able with piston rings of less than, forexthe lathe and an auxiliary flanged plate or ample, 4 m. m. thickness,s nce the rings are ring, in such manner that,'when the inner liable tofracture and only an ineffective face of the piston ring has been turneddown, clamping will obtain.

a flanged disc may be inserted through the The invention has for itsobject to overcome aperture of the auxiliary ring to hold the pisthesedisadvantages and consists in providing 10 ton ring securely in positionfor turning down a pair of clamping rings between which the of the outerface. piston ring or rings to be turned down are In a hitherto knownarrangement of this held, said clamping rings being of equal ditype theauxiliary clamping ring is screwameter and co-axially aligned, so thatthe rethreaded at its lower end for engagement sulting clamping pressureis parallel with the 15 with the surface plate of the lathe, the pistonaxis of theassembled device. and is centrally 130 ring being heldbetween said surface plate dlsposed with respect to the width of thepisand the flanged auxiliary ring, the effective ton ring or rings.diameter of the flange being greater than the A further object of theinvention lies in the inner diameter, and less than the outerdiprovision of clamping means by which any '29 ameter, of the pistonring. This arrangenumber of piston rings may be treated in one ment,however, is not entirely satisfactory operation.

since the ring must be carefully constructed In the drawing:

of a gauge such that it will accurately encir- Figure 1 shows alongitudinal section of cle the piston ring and prevent distortion ofthe devlce with a number of piston rings as- 2 said piston ring duringtightening of the auxsembled for tu ning the inner edges. iliary ring onthe surface plate. This inter- Flg re 2 1S a longitudinal section of theferes withthe treatment of the piston rings, vice assembled for turningof the outer particularly if several rings are being treated ges Of hepiston rings. in one operation, since the auxiliary ring sur 1illustrates a plston ring, of which a plu- 30 rounds the outer face ofthe iston ring or rality are SllOWIl its ELSSQHlblGCl between the ringsand renders it difficult to determine the nnular clamping rings 2, 3.The clamping oint of contact of said ring or rings adjarlngs areheldtogether by means of bolts 4; cent the supporting surface plate ofthe lathe. pa sing freely through holes in the plate 2 A furtherdisadvantage, however, lies in and being threaded into correspondingholes 35 the fact that, with this known arrangement, 1 th p ate 3- Therings 2, 3 are provided so only one of the clamping members i. e. the wth lnward ly directed, annular, axially supporting portion of thesurface plate, enlgnetl p rtlons 2*, 3 of equal diameter gages thepiston ring centrally with respect adapted to engage the outer faces ofthe end to its width, the other clamping member i. e. rings and whenthese latter are clamped either the auxiliary ring or the auxiliarydisc, in position by the bolts 4: said annular porengaging only theannular edge of the ring. tions 2 33 engage centrally of the pistonrings The direction of the resulting clamping preswith respect to theirwidth as shown in the sure therefore deviates from the axial planedrawing. of the device and tends to cause thepiston After the device hasbeen thus far as- 45 rings to tip or bend. This is particularlynosembled it is secured to the surface plate 6 9 of the lathe by meansof a threaded disc or cap 5, flanged to engage over the inner endclamping plate 2 and the turning operation on the inner edges of thepiston rings may now be effected.

When this operation has been completed the cap 5 is unscrewed from thesurface plate 6, and the piston rings 1 and clamping plates 2 and 3.still securely held together by the olts 4, are reversed and slid bodilyon to a mandrel 7 (Figure 2) of a further surface plate. The end ring 3is spaced from the surface plate by means of a ring 9 whilst theassembled piston ring 1 and the end rings 2, 3 are then securelyattached to the mandrel 7 as by a bolt 10 passing through a hole in theouter clamping plate 2 and threaded into a hole in the mandrel. Thebolts 4 are then entirely Withdrawn, the piston rings being, owever,securely held in axially aligned position for the turning of their outeredges.

What I claim and desire to secure by Let ters Patent of the UnitedStates is 1. cans for assembling piston rings in order to turn theirarcuate outer and inner faces, including the combination of a pair ofclamping rings adapted to clamp between them the end faces of a seriesof piston rings intermediate the arcuate outer and inner faces thereof,which pair of clamping rings are adapted to be temporarily securedtogether with the intermediately clamped piston rings into an assembled.unit, and in which pair, one clamping ring is provided exteriorly withmeans adapting the ring to lit centrally upon a face plate on a latheand be secured thereto for turning the interior of said series of pistonrings, the other clamping ring having a clearance opening thereinproviding for the entrance of a tool and escape of turnings, and meansupon said first clamping ring adapting the same when said assembled unitis axially reversed and passed in upon a flanged mandrel interchangeablewith said face plate, to be secured to the end of said mandrel andthereby clamp said other clamping ring against the flange upon saidmandrel, whereupon said piston rings are adapted to be exteriorlyturned.

2. Means for assembling piston rings in order to turn their arcuateouter and inner faces, including the combination of a pair of clampingrings adapted to clamp between them the end faces of a series of pistonrings intermediate the arcuate outer and inner faces thereof, which pairof clamping rings are adapted to be temporarily secured together withthe intermediately clamped piston rings into an assembled unit by meansof removable clamping bolts arranged exteriorly to said piston rings,means for centering one of said pair of clamping rings upon the faceplate of a lathe and a flange upon said one ring adapted to be engagedand retained by a retaining collar attachable to said face plate inorder to provide for turning of the interior of the piston rings, theother of said pair of clamping rings having a clearance opening for theentry of a tool. and the escape of turnings, there being an aperture insaid first clamping ring adapted when said ring assembly is axiallyreversed and passed in upon a flanged mandrel, to receive a clampingscrew attachable to the end of said mandrel in order to clamp said otherclamping ring against the flange on said mandrel and provide for removalof said exteriorly arranged clamping bolts and exterior turning of saidpiston rings.

3. Means for assembling piston rings in order to turn their arcuateouter and inner faces, including the combination of a pair of clampingrings adapted to clamp between them the end faces of a series of pistonrings intermediate the arcuate outer and inner faces thereof, which pairof clamping rings are adapted to be temporarily secured together withthe intermediately clamped piston rings into an assembled unit, meansfor centering one of said pair of clamping rings upon the face plate ofa lathe including a projection on the one and a corresponding recess inthe other and means for releasably attaching said one ring to said faceplate in order to provide for turning of the interior of the pistonrings, the other of said pair of clamping ringshaving a clearanceopening for the entry of a tool and the escape of turnings, there beingan aperture in said first clamping ring adapted when said ring assemblyis axially reversed and passed in upon a flanged mandrel, to receive aclamping screw attachable to the end of said mandrel in order to clampsaid other clamping ring against the flange on said mandrel and providefor arcuate exterior turning of said piston rings.

4. Means for assembling piston rings in order to turn their arcuateouter and inner faces, including the combination of a pair of clampingrings adapted to clamp between them the end faces of a series of pistonrings intermedia e the arcuate outer and inner faces thereof, which pairof clamping rings are adapted to be temporarily secured together withthe intermediately clamped piston rings into an assembled unit by meansof removable clamping bolts arranged exteriorly to said piston rings,means for centering one of said pair of clamping rings upon the faceplate of a lathe, including a central projection on said ring and acorresponding recess in saidface plate, and means for releasablyattaching said one ring to said face plate in order to provide forturning of the interior of the piston including a flange upon said onering adapted to be engaged and retained by a retaining collar attachableto said face plate, the other of said pair of clamping rings having aclearance opening for the entry of a tool and the escape of turnings,there being an aperture in said first clamping ring adapted When saidring assembly is axially reversed and passed in upon a flanged mandrel,to receive a clamping screw attachable to the end of said mandrel inorder to clamp said other clamping ring against the flange on saidmandrel and provide for removal of said exteriorly arranged clampingbolts and exterior turning of said piston rings.

5. Apparatus according to claim 2 wherein the heads of the exteriorclamping bolts when in position extend into recesses in the face plate.ALEXANDER ABRAMSON.

